Improvement in dampers



UNITED STATES PATENT OFFICE.

FRANCIS M. HUBBARD, OF PROTECTION, NEW YORK.

iMPRovEMi-:NT IN DAMPERS.

Specification forming part of Letters Patent No. 38,04 5, dated March 31, 1863.

To aZZ whom t may concern:

Be it known that I, F. M. HUBBARD, of Protection, in the county of Erie and State of New York, have invented certain new and useful Improvements in Dampers for Stove- Pipes 5 and I hereby declare that the foliowing is a true and exact description of the same, reference being had to the accompanying drawings, and to the letters of reference marked thereon.

In the figure marked lin the drawings, the letter A represents a vertical section of the s'tovepipe, and O the damper in position. The damper consists of a tube or pipe, C, the convexoconcave plates -ct a, and of the rim B. The tube C is an inch (more or less) smaller in diameter than the pipe A, and has its position in the center of pipe A, being suspended there by the pivots b b, which are attached to opposite edges of the rim B. The rim B is placed midway ofthe tube G, and consists ot' a metallic plate encircling, and at right angles with, the tube G, and illing the bore of the pipe A, so nearly as barely to admit of the rim B turning on its pivots, which pivots b b rest in slots cut in the upper edge of the pipe A. To one of these pivots is attached the crescent-shaped handle e, by which the damper can be removed or placed in any required position. Through the center of the bore of the tube C an iron rod passes with a screw cut on each end. On these screws are adjusted the conveXo-concave plates a a, the concave side of each facing the rim B. The diameters of a a are less by near half an inch than the bore of the pipe A, and they are arranged sufficiently far from the ends of tube O to admit a free passage of the smoke be tween them.

The operation of my damper is simple and effective. The smoke in ascending is arrested by the rim B. It then finds egress between the upper concave and the interior of the pipe A. The heat, on the other hand, governed by the laws of radiation, strikes the polished convex side of the lower et and is reflected back at the same angle, and its escape thus prevented.

Having thus described my invention, what I claim, and desire to secure by Letters Paten t, 1s-

The tube O, the convexoconcaves a a, and the rim B,when combined with the pipe A, the whole constructed and operating in the manner and for the purpose substantially as herein set forth.

In testimony that I adopt the foregoing as my own I hereby affix my signature in the presence of two witnesses.

FRANCIS M. HUBBARD.

Witnesses SETE KrNesLEY, A. LYEoRD. 

